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AJvYcCX2pJFDixjPHOSPh1Gq1f6Jf7BoWMwrZtPYqT6Jree5Bu+7bHoohaHB/Bbrnc9zM8u2zfOh2jtElzED6ys=@vger.kernel.org X-Gm-Message-State: AOJu0YyOZfnPmFybArg0TQveFa9w9NdSIgIzzUZd2tU/KfQUrJpWLjyp Tk7UxvhWipVhJShtdFnnHKpNkaIqI9JiyrDOa+/op5+x8u8FHwvS6wPN3qrmtW6Ujt/0WRmWKcu 1Z0CP6g== X-Google-Smtp-Source: AGHT+IEhIwcr6ikR86NXDpgfcAQublPKVJCRuEFifK28YdTxbvKmmfgddvnr2t043GixUvzzZ12CrvVkj/A= X-Received: from pjj15.prod.google.com ([2002:a17:90b:554f:b0:311:eb65:e269]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2f0c:b0:315:9ac2:8700 with SMTP id 98e67ed59e1d1-315f269caabmr4382059a91.24.1750856346092; Wed, 25 Jun 2025 05:59:06 -0700 (PDT) Date: Wed, 25 Jun 2025 05:59:04 -0700 In-Reply-To: <24675ed2-e3ae-4473-9d8e-acd378da220c@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250610175424.209796-1-Neeraj.Upadhyay@amd.com> <20250610175424.209796-4-Neeraj.Upadhyay@amd.com> <20250623114910.GGaFk_NqzGmR81fG8f@fat_crate.local> <24675ed2-e3ae-4473-9d8e-acd378da220c@amd.com> Message-ID: Subject: Re: [RFC PATCH v7 03/37] x86/apic: KVM: Deduplicate APIC vector => register+bit math From: Sean Christopherson To: Neeraj Upadhyay Cc: Borislav Petkov , linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, Thomas.Lendacky@amd.com, nikunj@amd.com, Santosh.Shukla@amd.com, Vasant.Hegde@amd.com, Suravee.Suthikulpanit@amd.com, David.Kaplan@amd.com, x86@kernel.org, hpa@zytor.com, peterz@infradead.org, pbonzini@redhat.com, kvm@vger.kernel.org, kirill.shutemov@linux.intel.com, huibo.wang@amd.com, naveen.rao@amd.com, francescolavra.fl@gmail.com, tiala@microsoft.com Content-Type: text/plain; charset="us-ascii" On Wed, Jun 25, 2025, Neeraj Upadhyay wrote: > > > On 6/23/2025 5:19 PM, Borislav Petkov wrote: > > On Tue, Jun 10, 2025 at 11:23:50PM +0530, Neeraj Upadhyay wrote: > >> diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h > >> index 23d86c9750b9..c84d4e86fe4e 100644 > >> --- a/arch/x86/include/asm/apic.h > >> +++ b/arch/x86/include/asm/apic.h > >> @@ -488,11 +488,14 @@ static inline void apic_setup_apic_calls(void) { } > >> > >> extern void apic_ack_irq(struct irq_data *data); > >> > >> +#define APIC_VECTOR_TO_BIT_NUMBER(v) ((unsigned int)(v) % 32) > >> +#define APIC_VECTOR_TO_REG_OFFSET(v) ((unsigned int)(v) / 32 * 0x10) > > > > Dunno - I'd probably shorten those macro names: > > > > APIC_VEC_TO_BITNUM() > > APIC_VEC_TO_REGOFF() > > > > because this way of shortening those words is very common and is still very > > readable, even if not fully written out... > > > > Sounds good to me. Will change this in next version (will also wait for Sean's > comment on this). My vote is for the long names. I find REG_OFFSET in particular to be much more self-documenting. My brain gets there eventually with REGOFF, but I just don't see the point in shortening the names. The only uses where line lengths get a bit too long are apic_set_isr() and apic_clear_isr(), and the lines are still quite long with the shorter names.